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- W2743559500 abstract "The 10 d recoveries of the mechanical properties and crack sealing of an ordinary Portland cement (OPC) clinker/natural zeolite (ferrierite (Fer)) blend modified or unmodified with silica were tested at 270°C in water and alkali carbonate environments. The recoveries of the samples depended on their modification with silica and the curing environment, but were more than 100% after repeated damage under some test conditions. The mechanical properties and phase compositions of recovered samples were evaluated by compressive strength measurements and x-ray diffraction, differential thermogravimetric analyses, Fourier transform infrared analyses and scanning electron microscopy coupled with energy dispersive x-ray spectroscopy. The sealing of 0·25 mm wide and ∼2 mm deep cracks was visualised with a three-dimensional optical microscope. Fer decomposed under high-temperature alkaline conditions with the release of hydrolysates that, along with the hydrating clinker, participated in the formation of new phases contributing to strength recoveries. These phases included crystalline magnesium and aluminium-containing silicates, calcium and carbonated calcium silicates and amorphous hydrates. Crack sealing was complete for the silica-modified samples and partial for unmodified ones cured in carbonate environments. The sealing was very poor for samples cured in water. The main sealing phases included crystalline and amorphous silica, high-temperature-stable zeolites and talc mineral." @default.
- W2743559500 created "2017-08-17" @default.
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- W2743559500 date "2018-01-01" @default.
- W2743559500 modified "2023-10-17" @default.
- W2743559500 title "Self-repairing properties of OPC clinker/natural zeolite blend in water and alkali carbonate environments at 270°C" @default.
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- W2743559500 doi "https://doi.org/10.1680/jadcr.16.00136" @default.
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